The latter duo combined for 62 goals while at Borussia Dortmund together in the 2015-16 season and Arsenal fans will be hoping that partnership can help the club fulfil their top four ambitions.
Despite big investment, Everton have struggled to break away from mid-table this season and now sit in ninth, a full 11 points behind sixth-placed Arsenal, but Gunners manager Arsene Wenger is not willing to underestimate their opponents on Saturday.
It marked the Donegal man's first time playing a senior competitive game since breaking his leg in a drawn World Cup qualifier for the Republic of Ireland against Wales back in March 2017.
"I want to play against Arsenal, of course, but nowadays with sport science and things like that it's a lot more analytical".
"Everyone can understand why he has left because now he has the opportunity to be one of the key players for Everton now". Everton, who themselves have had a decent January market after signing Walcott and striker Cenk Tosun, both of whom are expected to start against Arsenal.
Here is Arsenal's strongest possible 4-2-2-2 XI vs Everton.
If we start with Gana and Schneiderlin in midfield I might just hang myself.
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Danny Welbeck is still sort of fitness and will certainly miss the game as will Santi Cazorla, who is still recovering from his surgery.
Although he has been suffering from sickness this week and his not a definite starter, Aubameyang is 4/5 to score on his Gunners debut.
It's deadline day, which means transfer craziness and everyone getting very excited.
Young attacker Lookman completed his rather left-field loan move to Bundesliga outfit RB Leipzig, while out-of-favour midfielder Muhamed Besic joined Middlesbrough on loan until the end of the season.
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